Knight Capital Group Inc is being forced to raise money after an erroneous trading position wiped out $440 million of its capital, the firm said on Thursday, causing its shares to shed half of their value.

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"We're losing the human control in our business," said Joe Anastasio, a founding partner of financial services consulting firm Capco who specializes in stock trading issues. "We've been so focused on automated throughput of orders and high-volume execution with no human intervention that we have lost the human logic factor when things go wrong."